甘肃白银银硐沟铜锌矿床地电化学异常特征、成晕机制及找矿预测

为了解铜、锌矿床的地电化学异常特征，探讨铜、锌矿床地电化学成晕机制，达到利用地电化学法来寻找隐伏铜、锌矿目的，在甘肃白银银硐沟铜锌矿床开展该方法的试验研究，并在已知矿体上方发现了Cu、Zn、Pb异常。异常值的高低排列顺序是Cu〉Zn〉Pb呈明显的电化学异常标志。室内对铜、锌矿的电化学溶解试验的结果表明，当铜、锌矿标本电解到24h，其溶液中的w（Cu^2＋）、w（Zn^2＋）、w（Pb^2＋）分别达到2．4×10^-6、1．8×10^-6、1．4×10^-6，充分证明铜锌矿床不但能产生电化学溶解，而且电化学溶解能力较强。经过在甘肃白银银硐沟铜锌矿区深部找矿预测，发现多处具有成矿远景的地电化学异常，表明该方法具有良好的找矿效果。

Features and Halo-forming mechanism of geo-electrochemical anomaly and exploration forecast in Yindonggou Cu-Zn deposit, Baiyin, Gansu province

For the purpose to learn the geo-electrochemical features of Cu-Zn deposit, to find out the halo- forming mechanism of geo-electrochemistry, and to search for the hidden deposits by the geo-electrochemical methods, the testing study has been carried out in the Yindonggou Cu-Zn deposit, Baiyin, Gansu province. Geo-electrochemical anomalies of Cu, Zn and Ph are found on the top of ore body, and the anomalies are in the order of Cu.Zn.Pb from high to low value, which are obvious electrochemical signs for anomalies. The ion concentrations of w（Cu^2＋）（2.4×10^-6）,w（Zn^2＋） （1.8×10^-6）, and w（Pb^2＋）（1.4×10^-6） can be obtained from solution after 24 hours based on the experiment of electrochemical dissolution for minerals. The experiment has proved that the geo-electrochemical dissolution is not only found in Cu-Zn deposits, but also it is quite strong. After working in the Yindonggou Cu-Zn mineralization area, several geo-electrochemical anomalies which may be indicated for the hidden orebodies are discovered in the exploration area. All these suggest that this method is useful in the exploration.